Eastern State PenitentiaryPhiladelphia, PA

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​Eastern State opened on October 25, 1829, and is considered to be the world's first true penitentiary. Its revolutionary system of incarceration, dubbed the "Pennsylvania system" or separate system, encouraged separate confinement as a form of rehabilitation.

Originally, inmates were housed in cells that could only be accessed by entering through a small exercise yard attached to the back of the prison; only a small portal, just large enough to pass meals, opened onto the cell blocks. This design proved impractical, and in the middle of construction, cells were constructed that allowed prisoners to enter and leave the cell blocks through metal doors that were covered by a heavy wooden door to filter out noise. The halls were designed to have the feel of a church.

Some believe that the doors were small so prisoners would have a harder time getting out, minimizing an attack on a security guard. Others have explained the small doors forced the prisoners to bow while entering their cell. This design is related to penance and ties to the religious inspiration of the prison. The cells were made of concrete with a single glass skylight, representing the "Eye of God", suggesting to the prisoners that God was always watching them.

Outside the cell was an individual area for exercise, enclosed by high walls so prisoners could not communicate. Exercise time for each prisoner was synchronized so no two prisoners next to each other would be out at the same time. Prisoners were allowed to garden and even keep pets in their exercise yards. When a prisoner left his cell, an accompanying guard would wrap a hood over his head to prevent him from being recognized by other prisoners.

Cell accommodations were advanced for their time, including a faucet with running water over a flush toilet, as well as curved pipes along part of one wall which served as central heating during the winter months where hot water would be run through the pipes to keep the cells reasonably heated. Toilets were remotely flushed twice a week by the guards of the cellblock.

The original design of the building was for seven one-story cell blocks, but by the time cell block three was completed, the prison was already over capacity. All subsequent cell blocks had two floors. Toward the end, cell blocks 14 and 15 were hastily built due to overcrowding. They were built and designed by prisoners. Cell block 15 was for the worst behaved prisoners, and the guards were gated off from there entirely.

In 1924, Pennsylvania Governor allegedly sentenced Pep "The Cat-Murdering Dog" (an actual dog) to a life sentence at Eastern State. Pep allegedly murdered the governor's wife's cherished cat. Prison records reflect that Pep was assigned an inmate number (no. C2559), which is seen in his mug shot. However, the reason for Pep's incarceration remains a subject of some debate. A contemporary newspaper article reported that the governor donated his own dog to the prison to increase inmate morale.

On April 3, 1945, a major escape was carried out by twelve inmates (including the infamous Willie Sutton), who over the course of a year managed to dig an undiscovered 97-foot (30 m) tunnel under the prison wall. During renovations in the 1930s an additional 30 incomplete inmate-dug tunnels were discovered.

The prison was designated a National Historic Landmark in 1965, and then closed in 1971.